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You may refer below blog which has sample scenarios for triggers with explanation.
https://tekslate.com/15-sample-triggers-different-scenarios/
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards
Sandhya
Refer these mentioned links for getting more command on the trigger--
http://www.vinaychaturvedi.com/blog/apex-triggers-in-salesforce/
https://teachmesalesforce.wordpress.com/category/trigger/
https://developer.salesforce.com/forums/?id=906F0000000kIWCIA2
https://tekslate.com/15-sample-triggers-different-scenarios/
http://www.sfdc99.com/2014/01/25/use-vs-triggers/
Thanks
Akshay